- Excluded are research volunteers for whom participation would not be clinically appropriate, who clearly could not participate. Psychotic, suicidal or homicidal patients require clinical management that is too intensive for this study, and we have no evidence that MI+HealthCall would be effective among injection drug users. Leaving New York precludes follow-up. Gross psychomotor/cognitive impairments that may hinder patients' HealthCall use. Hearing and severe vision impairments that preclude telephone use precludes randomization to MI+HealthCall.